Methods to filter out high rate noises for the LHAASO-WCDA project

Abstract

The Large High Altitude Air Shower Observatory (LHAASO) will be constructed at Mt. Haizi in Sichuan Province, China. Among several detector components of the LHAASO, the Water Cherencove Detector Array (WCDA) is of great importance for low-to-middle energy gamma ray physics. The WCDA, consisting of 4 ponds, covering an area of 90;000m2 in total, is sub-divided into 3600 cells by curtains, with a PMT resided in each cell. As located at 4400 m a.s.l. and 25m2 area governed by each PMT, the single rate of a PMT can reach as high as 35-45 kHz, bringing a big challange for data storing and event reconstruction. In this paper, a dedicated trigger scheme and a pre-reconstruction method aiming to deal with these high rate noises are introduced. These methods are tested with the Monte Carlo simulation data, showing a fair efficiency in filtering out noises, while most of the real shower signals are kept. This method is proposed to be applied in the future LHAASO-WCDA project, put in a stage of the online processing just after the data are acquired.

Department(s)

Physics

International Standard Serial Number (ISSN)

1824-8039

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2025 Sissa Medialab Srl, All rights reserved.

Publication Date

01 Jan 2015

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